1. To get training and minor stipend during my game development for the company ?
It depends on the company but you'd better off training yourself. In game development, that is.
2. Selling could be done or what ! If so which company do you prefer ?
I don't think there is any company looking for game ideas to purchase.
3. Any letter format you have used for success of the deal ?
I don't think it matters because of #2.
4. I also need a share in it , So I might be asking more ( I am confused , Has I think my idea can make enough money for the company ! )
Sorry to burst your bubble, an idea is not enough to make money for anyone. Even if the idea has been implemented and been made into a game, there are still long way to go to make enough money.
5. Or should I ask enough people to join in developing my game and start working on it , excepted to make a trailer to present to investors so we can get a bigger and better cut with employment to few many people from then on !
I believe you should make the game first before presenting to investors or anyone for funding.
So get ready to get your feet wet in game dev.